Really depends on what you call PvP. If it's strictly competitive arena (3s, 5s) and very high rating RBG (2.4+), then no. It has way less tools and utilities than Sub and Assa does much more overall damage.

Buf if you talk random BG, RBG sub 2.4 and 2s, then, as someone who went 2k+ in 2s during 5.0 in Combat, yes, I can say it is perfectly viable, and I find this spec very funny to play. Killing Spree is very powerful but very predictable and can be easily countered, keep that in mind.

No it is not enough. On my rogue i had ~34% main gauche chance, 13,5 energy/sec regen and the problem isn't energy regen itself but amount of cp you're generating compared to assasination/sub. 20% chance for extra combo point is completly trampled by HAT and SF. So all in all combat is cp starved, energy regen isn't really outpacing other specs by enough to matter and spec has no armor penetration, weakest combat builder and finisher.

For a matter of fact the only thing going for combat is killing spree that really have oneshot potential when it is done on a single target on 30% bg and with trinket poped. But then again shadowdance isn't far off dmg wise.

Killing Spree is too situational to make it viable. It has no armour penetration outside Shadow Blades and its long ramp-up time lets it down; trust me, I've been playing Combat the last 3 months.

The real problem with Killing Spree is that it attacks multiple targets when you only want it to attack one target. Its a PvE ability based around a PvE spec. Bandits Guile also hinders Combat greatly compared to the other two specs.

The real problem with Killing Spree is that it attacks multiple targets when you only want it to attack one target. Its a PvE ability based around a PvE spec. Bandits Guile also hinders Combat greatly compared to the other two specs.

Actually the problem with Killing Spree is that you need to get your target alone because otherwise it jump between multiple targets. The spec also suffers requires you to stay on target for a long period before Bandit's Guile reaches it's maximum damage.